The only vessel in Aces High that should have an ENY of 50 is the goon because it has no way of being on the offensive, it is always on the defensive. Even the lowly jeep has more of a chance of surviving contact with the enemy.
The 190A-8 is a beast, it is one of the best bomber hunters in the game thanks to its quad 20mm or dual 30mm/dual 20mm cannon options. The thing it is not though is a dog fighter, it has a very small bag of tricks with firepower and roll rate being about its only trump cards, and perhaps dive speed and energy retention. Otherwise, it certainly can not turn, climb, or accelerate. Once it gets below 200mph just bail and be done with it. Use it for what it was designed for and you'll see that the current ENY is not far out of line.
The M8 has saved more than 1 field from capture. It offers a lot of speed and a high rate of fire for troop carrier interdiction. Arm it with a 40/40 mix of AP and HE. Use the HE on everything other than tanks (yes, even vs FLAKS the HE wil lmore easily damage turret than AP, ditto vs M18's, M3's, etc), and confront tank only on their flanks or rear and get within 600 yards or so. Best bet is to keep moving and do what an M8 does best: scout and interdict.
Oh, and if you think that these three vessels are the only one in AH that need adjustment may I suggest you take some more time and learn the library a bit better. There are a whole host of aircraft and gv's that need adjustment.